Fuel Pipes

Hi i am putting the fiberglass tank back on my trident but the carbs have 2 pipes and the tap has only one outlet can anyone tell me which pipe goes to the tap
thanks ian

 

now sorted

 

Kind of helps others if you post the solution.... i suspect it was either a case of one fuel and one vacuum or just a simple case of using a T splitter to the carbs if it was two fuel feeds?

 

All i had to do was use a y connector and join the 2 pipes together